Active optical sensors are devices that emit their own light to detect objects or measure distances. They typically use lasers or LEDs to send out light pulses, which bounce off surfaces and return to the sensor. By analyzing the time it takes for the light to return, these sensors can determine the distance to an object, making them useful in applications like autonomous vehicles and robotics. These sensors are often used in various fields, including environmental monitoring and industrial automation. They can provide precise measurements and are effective in different lighting conditions, unlike passive sensors that rely on ambient light. Active optical sensors enhance safety and efficiency in many technological applications.